| Marvel Age Introductions by On-Sale Date |
| 1966 | FEB 3 | XMN019 | The X-Men | [XMROS•Professor X • Angel • Beast • Cyclops • Iceman • Marvel Girl] [The Mimic] |
| 1966 | SEP 01 | XMN026 | The X-Men | [XMROS•Professor X • Angel • Beast • Cyclops • Iceman • Marvel Girl] [The Mimic][] |
| 1966 | OCT 11 | XMN027 | The X-Men | [XMROS•Professor X • Angel • Beast • Cyclops • Iceman • Marvel Girl] [The Mimic]xo[Amazing Spider-Man] Quicksilver • Scarlet Witch •[Puppet Master] |
| 1966 | NOV 3 | XMN028 | The X-Men | [XMROS•Professor X • Angel • Beast • Cyclops • Iceman • Marvel Girl] [The Mimic][Factor Three] [Banshee] [Ogre] |
| 1966 | DEC 8 | XMN029 | The X-Men | [XMROS•Professor X • Angel • Beast • Cyclops • Iceman • Marvel Girl] [The Mimic][] |